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7 St. 46 Min, 1 Jan 1923 Jahr - 1923-1928 (Ogino) 1929(Knaus)-Discovered relationship of ovulation within menstrual cycle separate from each other -developed calendar formulas by determining that ovulation takes place during a fixed time period

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7 St. 46 Min, 1 Jan 1923 Jahr
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~ 102 years ago
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